Laminar mixed convection of humid air in a vertical channel with evaporation or condensation at the wall

Hammou, Z; Benhamou, Brahim; Galanis, Nicolas; Orfi, Jamel

doi:10.1016/j.ijthermalsci.2003.10.010

Cited by 51 publications

(34 citation statements)

References 8 publications

(26 reference statements)

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“…Simulation results were obtained for the variation of mean air temperature (T m ) and sensible Nusselt number (Nu s ) along the axial direction of the channel and the comparison results are shown in Figures 3(a) and (b), respectively. As can be seen from the above figures, the results predicted by the present numerical algorithm are in close agreement with the results of Hammou et al [13] obtained using velocity-pressure equations and SIMPLER algorithm.…”

Section: Mesh Sensitivity and Validation Resultssupporting

confidence: 91%

“…Our predicted results for the reattachment length and the local maximum Nusselt number are in close agreement with the above references. For the purpose of comparing our results for double diffusive mixed convection in a channel, the evaporation problem discussed by Hammou et al [13] has been considered. Simulation results were obtained for the variation of mean air temperature (T m ) and sensible Nusselt number (Nu s ) along the axial direction of the channel and the comparison results are shown in Figures 3(a) and (b), respectively.…”

Section: Mesh Sensitivity and Validation Resultsmentioning

confidence: 99%

“…The combined effect of thermal and solutal buoyancy forces in vertical parallel plates has received a considerable attention in evaporation and condensation applications. Hammou et al [13] studied the effect of buoyancy ratio and Richardson number on simultaneous convective heat and mass transfer during flow of humid air in a vertical channel with isothermal wet walls. Brown and Lai [14] studied the combined effect of heat and mass transfer in 165 a horizontal channel with open cavity and focused on the development of correlations for Nusselt and Sherwood numbers.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

Kumar

Murugesan

Gupta

2009

Numerical Methods in Fluids

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SUMMARYThis paper presents results on the combined effect of thermo-solutal buoyancy forces on the recirculatory flow behavior in a horizontal channel with backward-facing step and the ensuing impact on heat and mass transfer phenomena. The governing equations for double diffusive mixed convection are represented in velocity-vorticity form of momentum equations, velocity Poisson equations, energy and concentration equations. Galerkin's finite-element method has been employed to solve the governing equations. Recirculatory flow fields with heat and mass transfer are simulated for opposing and aiding thermo-solutal buoyancy forces by assuming suitable boundary conditions for energy and concentration equations. The effect of Richardson number (0.1 Ri 10) and buoyancy ratio (−10 N 10) on the recirculation bubble and Nusselt and Sherwood numbers are studied in detail. For Richardson number greater than unity, distinct variations in the gradients of Nusselt number and Sherwood number with buoyancy ratio are observed for flow regimes with opposing and aiding buoyancy forces.

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Section: Mesh Sensitivity and Validation Resultssupporting

confidence: 91%

Section: Mesh Sensitivity and Validation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

Kumar

Murugesan

Gupta

2009

Numerical Methods in Fluids

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“…Furthermore, different grid sizes were considered to ensure that the solution was gridindependent. Results of the grid sensibility study are given by Ait Hammou et al (2004) and Kassim et al (2010). These results show that heat and mass transfer parameters, as well as the local variables, obtained for three grids 100x35, 200x70 and 400x140 vary within less than 5%.…”

Section: Methodsmentioning

confidence: 92%

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Benhamou¹,

Oulaid²,

Kassim³

et al. 2011

Mass Transfer in Multiphase Systems and Its Applications

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“…Most of the studies in this category are concentrated on steady state laminar flow of Rayleigh number ranging from 10⁴ to 10⁶ [Desrayaud and Lauriat 2001, Hammou et al 2004and Laaroussi and Lauriat 2008. McBrain [1997], Catalin et al [2003] and Laguerre et al [2009] investigated temperature and mass concentration gradient induced laminar flow in an enclosure.…”

Section: Simultaneous Temperature and Mass Induced Buoyancy Driven Flmentioning

confidence: 99%

Interaction Effects Between Surface Radiation and Double-Diffusive Turbulent Natural Convection in an Enclosed Cavity Filled With Solid Obstacles

Iyi

Hasan

Penlington

2012

Proceeding of Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer.

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Citation: Iyi, Draco, Hasan, Reaz and Penlington, Roger (2012) Interaction effects between surface radiation and double-diffusive turbulent natural convection in an enclosed cavity filled with solid obstacles. In: International Symposium on Advances in Computational Heat Transfer ICHMT, 1-6 July 2012, Bath, England. URL:This version was downloaded from Northumbria Research Link: http://nrl.northumbria.ac.uk/8446/ Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) ABSTRACT The work reported here is a 2D numerical study on the buoyancy-driven low speed flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects and whose vertical walls are maintained at 1.2 and 21 o C. This is a case of double diffusion where both temperature and concentration gradients are significant. Detailed calculations were carried out and results compared with reliable data, with the aim of investigating the influence of surface emissivity on heat and moisture transport. The Rayleigh number of the fluid mixture (air and water vapour) based on the height of the vertical wall is found to be 1.45 x 10 9 . In the computations, turbulent fluxes of the momentum, heat and mass were modelled by low-Re (Launder-Sharma) k-ε eddy viscosity model. The effect of radiation has been found to be significant even for the moderate temperature difference of 19.8 o C between the hot and the cold walls with the humid air participating in the radiation heat transfer. Variations of average Nusselt number and buoyancy flux are analysed and profiles of turbulent quantities are studied in order to observe the net effect of the intensity of turbulence. It has been found that a change in surface emissivity influences the humidity distribution and heat transfer within the cavity. It was also observed that during natural convection process the air/water vapour combination results in an increase in the heat transfer as compared to pure natural convection. An increase in he...

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Laminar mixed convection of humid air in a vertical channel with evaporation or condensation at the wall

Cited by 51 publications

References 8 publications

Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Interaction Effects Between Surface Radiation and Double-Diffusive Turbulent Natural Convection in an Enclosed Cavity Filled With Solid Obstacles

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